Originally Posted by N4865G

Welcome to the world of noisy cockpits. You must be coming from the Airbus or the 787 with its quiet cockpit.
On longer flights I usually use the standard foam ear plugs which block the annoying avionics fan noise frequency and leave the ATC comms perfectly audible.
My audio tuning panel has the volume set at 60-70% and is clear enough to pick up relevant transmissions.
Try that, should help.
Otherwise, keep the headset on, but on longer flights it would be bothersome.